Cardboard box



,M I42 Egg 21 may NOV. 20, 1934. H, GREVE 1,981,836

' CARDBOARD BOX Fild June 14, 1953 2 Sheets-Sheet 1 28 29 g 29 2a 4 5 M1 INVENTOR [Y 'rmarz L. Gmre ATTORNEYS Nov. 20, 1934. H L, GREVE 1,981,836

CARDBOARD BOX F iled June 14, 1935 2 Sheets-Sheet 2 INVENTOR Mrman L. Gram BY A} 1 ATTORNEYS Patented Nov. 20, 1934 CARDBOARD BOX Herman L. Greve, Hollis, N. Y., assignor to International Mailing Tube and Wrapper Company, Long Island City, N. Y.

Application June 14, 1933, Serial No. 675,717

3 Claims. (01. 229-32) My invention relates to cardboard boxes, of the type that are erected from blank formed sheets.

It is well known that where such boxes or cartons are used for packaging merchandise to be shipped by mail or express, the corners of the package are most liable to damage in transit. It is the principal object of my invention, therefore, to provide improved integral means for reenforcing the corners of such boxes, which means shall be simple, inexpensive and easy to assemble.

A further object of my invention is to provide improved means for interlocking overlying portions of a cardboard box to hold suchportions in laminated relation. I

Referring to the drawings which form a part of this specification:

Figure 1 is a plan View of a blank cardboard sheet embodying the features of my invention. Regarded in another aspect, the figure represents a cardboard box embodying my invention in knocked down condition.

Figure 2 shows the blank partially erected.

Figure 3 is a fragmentary view in perspective illustrating the manner in which the corner reenforcing sections are relatively folded and interlocked.

Figure 4 is a view similar to Figure 2 showing the box in a further stage of assembly.

Figure 5 is a sectional view of the completely assembled box and shows the interior disposition of the corner reenforcing means.

Figure 6 is a fragmentary view of a blank similar to the blank shown in Figure 1 and illustrates a modification of the corner reenforcing means.

Figure 7 illustrates the assembly of the corner reenforcing means shown in Figure 6.

The blank shown in Figure 1 is scored, as indicated in broken lines, to define a number of integral portions, all of which are foldable relative to each other. When so folded and interlocked, as hereafter described, a box embodying the improved features of my present invention is provided.

The portions of the blank include a bottom portion 20, contiguous to which are four side por tions 21-21 etc. Three of the side portions each carry a flap 22, and a cover 23 is carried by the fourth side portion. A closure flap 24 is appended to the cover 23 and has an aperture therethru at 25 adapted to receive a pliable metal clip 26 afiixed to the opposite side portion.

A corner reenforcing strip 27 is carried at each end of two opposite side portions 21. Each of these strips is divided into three relatively fold able sections, the intermediate section 28 of which i l 1 l is designed to overlie and interlock with the inner section 29. The interlocking means shown in Figures 1 to 5 inclusive comprises tabs 31 and 32 formed in thesections 28 and 29, respectively, the tabs being positioned slightly different dis- 6G tances from the'folding score dividing the sections so that when the strip is folded, the smaller tab 31 will overextend the larger tab 32. Both tabs are defined by slots extending from the edges I v of their respective sections so that when the sections are laminated, as illustrated in Figure 3, a slighttwisting of the sections 28 and 29 will cause them to interlock as shown in Figure 2.

When the inner sections of the corner strips .have been folded and interlocked, as above de- '10 scribed, the strips 27 are folded relative to the side portions towhich they are attached, thus at the same time bringing their sections 30 to face against such side portions which are then folded relative to the bottom portion 20. The re- '35 maining side portions 21 are then foldedup against the interlocked sections of the reenforc ing strip, the flaps 22 are folded in, and the cover portion 23 is folded down to overlie the flaps, whereupon the closure-flap is folded down 30' and fastened by means of the clip 26.

It will be obvious that the strips 2'7 may be made somewhat longer and an additional foldable section may be provided at the end thereof integral with the sections 30 and similarly con- '5:

structed to interlock therewith for the purpose of providing'the same degree of reenforcement at both sides of each box corner if desired.

The modification illustrated in Figures 6 and 7 discloses that the tabs 31 and 32 may be of dif- '0 ferent and differing shapes. These tabs are assembled in interlocked relation by twisting the laminated sections 28 and 29 together in all respects as heretofore described and have some advantage over the exact structure shown in the previous structure in that the rounded edge of the tab 32 facilitates assembly.

I claim:

1. In cardboard boxes and the like, means for interlocking juxtaposed edge margins of two laminated layers of material, said means comprising a tab integral with each layer and defined by a slit extending from the juxtaposed edge of each layer, one of said tabs being arranged and positioned to overextend the other and to interlock therewith.

2. In cardboard boxes and the like, means for interlocking juxtaposed edge margins of two lamv inated layers of material, said means comprising two tabs, one integral with each layer, said 10...

reinforce a wall at one side of the box corner, and means for interlocking the juxtaposed edge margins of said sections, said means comprising a tab integral with each layer and defined by a slit extending from the juxtaposed edge of each layer, one of said tabs being arranged and positioned to overextend the other and to interlock therewith.

HERMAN L. GREVE. 

